<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .a {
            position: absolute;
            top: 0;
            right: 0;
            width: 100%;
            height: 100px;
            background-image: url(https://cdn.jsdelivr.net/gh/MobiusBeta/assets/images/Wave_Middle.png);
        }
        
        .a:nth-child(1) {
            background-size: 130% 150px;
            opacity: .5;
            animation: a 7s infinite alternate-reverse;
        }
        
        .a:nth-child(2) {
            background-size: 140% 150px;
            opacity: .6;
            animation: a 10s infinite alternate-reverse ease-in;
        }
        
        .a:nth-child(3) {
            background-size: 150% 150px;
            opacity: .7;
            animation: a 4s infinite alternate-reverse ease-in;
        }
        
        @keyframes a {
            0% {
                background-position-x: -200px;
            }
            50% {
                background-position-x: 500px;
            }
            100% {
                background-position-x: 800px;
            }
        }
    </style>

</head>

<body>

    <div class="a"></div>
    <div class="a"></div>
    <div class="a"></div>

</body>

</html>